Corsa Garage in the US has a few different versions; https://www.corsagarage.com/collect...oducts/ducati-998-3-piece-carbon-fiber-airbox Looks like this one will fit the 998 with standard size air runners and standard tank. Not sure on the 996 but the Corsa Garage folks are pretty responsive on Facebook. I bought a 998R tail from them and the carbon looks good to me (but I’m not an expert!).
There is this one in a shop in Denmark: http://webshop-fimotorcykler.dk/product/44220091b-3840/ But why a part of it is red I don’t know..
Here's a 748R ATR carbon airbox also in Japan -> https://www.ebay.com/itm/DUCATI-748...730833?hash=item3d69b8e851:g:bU0AAOSw6chalga7 And a 996SPS -> https://www.ebay.com/itm/DUCATI-996...544059?hash=item3d69c550fb:g:LkAAAOSwjXNbAQO9
Have you email speed carbon they produced a lot of the Ducati stuff historically Their service is good and the quality is outstanding.